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I use visible dust products to clean sensors.
The first time on my D800E I messed up, I had some oil specs on the sensor (no idea were they came from).
The result as a nice colourful pattern on the sensor and I had to go to the repair centre (20min drive) where they cleaned it at no charge.
Last month I did it myself again with no problems.
BTW at the repair centre they use the same method as described by Michael/mshi (they use flat tweezers though).